Drill



Feb. 13, 1923.

1. Ff JOY.

DRILL.

FILED EE.1, 1919.

2 SHEET p.SHEET 1.

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2 SHEETS-SHEET 2.

l. F. JOY.

DRILL.

FILED FEB.|8.1919.

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Patented Feb. 13, 1923.

- UNITED STATES 1,445,086 PATENT oFFlcE.

JOSEPH F. JOY, OF NEW BETHLEHEM, PENNSYLVANIA, ASSIGNOR TO J'OY MACHINE COMPANY, OFl PITTSBURGH, PENNSYLVANIA, A CORPORATION OF DELAWARE.

DRILL.

To all whom t may cof/wem: A

Be it known that I, JOSEPH F. JOY, a citizen of the UnitedStates of America, residing at New Bethlehem, in the county of Clarion and State of Pennsylvania, have invented certain new anduseful'lmprovements 'in Drills, of which the following is a specification.

This invention relates to certain new' and useful improvements in drills, and is especially designed to form shot holes in coal veins. i

Vhen elec-tric power was adopted in coal mines in lieu of compressed air', electric motor driven coal drills naturally came into use. Itwas soon found that the choking or sticking of the drill bits overloaded and burned out the electric motorsv instead of merely stalling the same with -no ill after effects as had been the case with air motors. With a view to overcome this trouble of burned out electric Amotors, the manufac'- rturers of electric coal drills increased the strength of their products andconsequently the weight thereof to such an extent .that electric coal drill operation became a two man proposition. It is the primary object of the present invention',..therefore, to produce a one man electric coal drill by incorporating protective and power conserving features therein which permit the use of light parts.

In using a feed screw or rackto form a requiring a change from short to longer augers or bits every two feet. Another reason for-'the present necessary use of short drill bits and short feed screws or stems, is the absence of some means to prevent slopping or wabblng of the' drillfout of true under the feed pressure especially when the feed action is positive. It is a further object of the invention. therefore, to provide a force feed drill of telescopic construction so as to occupy a minimum amount of space .greatly lessen the cost and weight of devices 'and .illustrated in operative position. ina

f Fig. is a fragmentary enlarged detail lengthwise and thereby permit the use of a full length bit or auger to expedite the drilling operation by overcoming the necessity of changing the drill bits. A further object of the invention is to` of this kind 'and' at the same time also irnprove' the 4practicability and durability thereof. l.

A still further object of the invention is to provide a coal drill which is so operated ythat destruction of mechanism or breaking of the auger or bit is extremely unlikely.

With there above general objects in vie-w and othersA that will Ibecome apparent as thenature of the invention is better understood, the same consists in the novel form, combina-tion and arrangement of parts hereinafter more fully described, shown in the accompanying drawings and claimed. 75 In 4the accompanying drawings forming part of this specification, and in which 'like reference characters indicate .similar parts throughout the several views,

Figure 1 is a top plan vieweof a drill constructed in accordance with the present-invention, .l Fig. 2 is a side elevational view of the device shown in Fig.' 1, partly broken away,

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F1g. 3 isa transverse seetlonal view ofthe 'drill taken substantially on line Ill-IH/of Fig. 1,'and showing in dotted lines and by arrows the 4tendency of the motor to'turn over when the bit sticks or chokes,

Fig. .4 is a transverse sectional view bf the drill taken substantially on line IV-IV of Fig. 1,

view, partially in section and partially in elevation, taken substantially onl line V-V ofFig.l,

Fig. 6 is an enlargedfragmentary detail view, partly in section and partly in elevation, taken substantially on line VI-VI of igQT is a fragmentary plan vie-w showing a modification of a portlon of the device shown in Fig. 1, .and

Fig. 8 is a side elevational view of the device shown in Fig. 7, partly broken away.

Referring more 'in detail to the several I a suitable motor 12, preferabl viewshthe device includes anopen elongated rectangular frame formed of end members 9 and side members 10, preferably of tubular form and joined. at the corners of the frame by l..couplings 11. v

' Arranged between the side members 10, is electrical,

vwhich is controlled by the switch 13 and which is movable longitudinally of theframe vin order to move with the drill bit 14 when,

the latter is fed to its`v work. The motor,A is slidably mounted for movement longitudinally of the frame by means of sleeves 15 carriedA by the oppositesides thereof and loosely encircling the side members 10 of the frame.

lt is usual in drilling shot holes, to 'drill the same a depth e ual to the thickness of the vein and hereto ore this has been'done 1by first drilling part way by a short drill bit and then successively substituting longer bits until the necessary depth has been attained. rlhis has been necessary in order to prevent the longest bit from breaking as the same would notbe properly supported and bracedl against breaking strains, when beginning to drill-the' hole with prior constructions. ln order to avoid the delays caused by the above,'l have. provided guides or braces 16 and 17 which loosely surround the bit 14 so that a single long bit is used to drill-the entire hole. rlhe guide 16l is of tubular form and is rigidly positioned at the forward end of the frame .between the members 9 thereof as shown in Figs. 1 and 7. rlhe motor casing is provided with handles 12 for the purpose of drawing the bit from the hole or moving it back and forth therein to clear the hole when serious choking occurs.

Arms 18 extend from opposite sides of the guide 17 transversely of the frame and are provided on their outer free ends with vsleeves 19 which loosely embrace Sthe side members 10 so that said guide 17 may bev 45 moved toward or away from the guide 16.

Projecting laterally from the sleevel at one side of the frame is a lug 20 to which one end lof a exible member or cable 21 is 'fastened,fsaid cable extending forwardly to A and around pulleys 221 carried by the lugs 23 extendin from the couplings 1l at the` forward en of the frame. The cable 21 is then extended rearwardly to a drum 24 journaled on a stu-b shaft 25 carried by the adj acent sleeve 15 so that, by rotating said drum, j

in one direction, through the instrumentality vof handle 26, the cable 21 is Wound upon the drum and thereby causes motor 12 and bit 14 to move forwardly toward the work. lt is to be understood that bit 14 is secured tov or geared to the armature shaft of motor 12 as is usual in this type of device and that A. motor 12 will move forwardly to engage guide 17 and then slide the latter along toward the guide 16. i

"matinee ln practice, the bit 14 often becomes over- I loaded or 'stuck and if the same is caused by positive means to continue feeding into the work `under this.conditioii, the said bit will be broken or' the motor overloaded unless `extremely bulky and heavy. By providing the hand feed above described, the operator can feel the tendencyof the bit to stick and immediately cease feeding, lessen the speed of feeding, or may clean the hole by sliding the drill bit in and out of the sameby means of handle 12 thereby avoiding breakage of the bit and enabling one use comparatively light and cheap parts 1n the drill.

lt has also been found that a live and one half horse-powermotor must be Vused in ator, the drill bit becomes stuck, ll avoid the breakage of said bit or burning out of the motor by pivotally mounting the frame on a pin 27 so that the same together with the motor 12 may turn over as shown in lFig. 3.'

With this construction the reaction ofthe overload ofthe motor tends to revolve the vframe in a direction opposite-to the direction of rotation of the drill, and as the feed drum is carried bythe frame, the operator will receive Warning 4that the rate` of feed is too great orthat the bit is choking. The pin 27 is rigid with a bracket 28 and extends through the sleeve ,29 carried by the rear end of the frame, said pin being retained therein by a suitable cotter pin 30.

The bracket 28 is pivoted for vertical movement as at 31 to the sleeve 32 and the sleeve 32 is slidable on the shank of the screw jack post 33, a suitable set screw 34 being provided in order to retain the sleeve 32 in any of its adjusted positions on said jack post. By this arrangement, the frame may be supported at any desired height at its rear end and may be swung vertically to the desired elevation at its forward end.

ln starting to drill a shot hole, it is often ldesirable to provide ameans to support the forward end ofthe frame, and in Figs. 7 and 8 ll have shown a modification of' the device shown in the 'other figures having props for this purpose. lin this form of the device, the members 9 and 10 are joined by three-wa ,couplings 11 each of Which has a rod 5 swivelled therein as at 36. The rods 35 have integral sleeves 37 through which are slidably positioned the props 38 having heads 39 to prevent said AVprops from moving downwardly entirely through said sleeves., The props 38 are extended to pointed ends in accordance with the form of the lower portion of jack 33 as seen in Fig. 2. The rods 35 are swiveled so that the props may be set at any desired inclination and suitable pins may be placed through any one of the perforations of the props t-o support .the forward end of the frame at the desired height. `In this form of the invention, the pulleys 22 are supported by brackets 23 clamped to the4 side members 10 adjacent the couplings 11.

In operation, the device is set up as shown in Fig. 2, and the motor is started. The

operator then rotates drum 24 andv thereby feeds-the drill until the hole is cut the required depth. r

It is believed that the construction and operation ofy the present invention as well as the advantages thereof will be readily understood'by those skilled in the art from the foregoing description, and while the forms of the invention herein shown and described are what are believed to be the' preferred embodiments thereof, it is nevertheless to be understood that minor changes may be made in the form, combination, and

arrangement of parts without departing from the spirit and scope of theinvention as claimed.

What I claim as new is I1. A drill comprising an open elongated frame including side and end members, a

motor arranged between and supported by the side members foi' movement longitudinally of the frame, a drill bit extending longitudinally of the frame and projecting beyond the forward endv therbf, said bit v being rotatable by said motor,- means to move said -motor forwardly to feed thedrill bit to its work, a stationary guide for said drill bit at the forward end of the frame, and a second transverse rear guide for Vsaid drill bit supported by 4said sidemembers for movement longitudinally of the frame, said second guide being forwardly movable by said motor.

2. A drill comprising a frame, a motor movable longitudinally of the frame, a drill bit rotatable by the motor, a stationary guide for the bit carried by the forward end of the frame, and a second transverse rear guide for the bit movable longitudinally of the frame, said second guide being vforwardly movable-'by engagement of said motor therewith.

3. A drill comprising an open elongated frame including side and end members, a motor arranged between and supported by the side members ,for movement longitudinally of the frame, a drill bit extending longitudinally of the frame and projecting beyond the forward end-thereof, said bit being rotatable by said motor, means to move said motor forwardly to feed the drill bit to its work, and a transverse guide for said drill bit supported by said side members for movement longitudinally of the frame, said guide being forwardly movable by Said motor.

4. A drill comprising a frame, a motor movable longitudinally of the frame, a drill bit rotatable by the motor, and a guide for the bit movable by said motor longitudinally 0f the frame.

5. A drill comprising an upright support-A ing means, a frame pivoted at its rear end to said supporting means for vertical swinging movement,l a drill bit, means carried by said frame to rotate said bit, means includ` ing props associated with the forward end of'the frame to support the same in vertically adjusted positions, said props being swivelly connected to the frame whereby the same ma be placed at a desired inclination.

6. A rill comprising an open elongated frame including side andl end members, a motor arranged between and supported by the side members for movement longitudi-v nally of the frame, a drill bit extending lon! gitudinally of the frame and projecting beyond the forward end thereof, said bit being operatively connected to said motor, means to, move said lnotor to feed they drill bit to its work,l anda support pivotally connected to the rear end of said frame whereby the latter together with the motor may Y -axially rotate when the bit becomes overloaded or stuck.

7. yA 4drill comprisinga frame, a motor movable longitudinally of the frame, a drill bit rotatable byv the motor, and a support to which the rear end of said frame is pivture.

JOSEPH F.v J GY. 

